JP2010131699A - Vitrified bond grindstone - Google Patents

Vitrified bond grindstone Download PDF

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JP2010131699A
JP2010131699A JP2008309374A JP2008309374A JP2010131699A JP 2010131699 A JP2010131699 A JP 2010131699A JP 2008309374 A JP2008309374 A JP 2008309374A JP 2008309374 A JP2008309374 A JP 2008309374A JP 2010131699 A JP2010131699 A JP 2010131699A
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vitrified bond
binder
grindstone
grains
vitrified
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JP5369654B2 (en
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Shinji Soma
伸司 相馬
Hiroshi Morita
浩 森田
Tomokazu Yamashita
友和 山下
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JTEKT Corp
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JTEKT Corp
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Priority to JP2008309374A priority Critical patent/JP5369654B2/en
Priority to US12/624,710 priority patent/US8177871B2/en
Priority to CN200910225700.XA priority patent/CN101745874B/en
Priority to EP09177708A priority patent/EP2193881B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
    • B24D3/14—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings
    • B24D3/18—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings for porous or cellular structure

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide vitrified bond grindstone having strong holding force of an abrasive grain, having good dressability, manufactured at a lower cost, and having a long life. <P>SOLUTION: The vitrified bond grindstone 13 is formed by combining and holding super abrasive grains 14 comprising a cubic boron nitride (CBN) particle or a diamond particle by a vitrified bond binder 15. The vitrified bond binder 15 includes oxide particles 15a and non-crystal glass 15b, and there are no continuous pores communicating with outside air at the inside of the vitrified bond binder 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、ＣＢＮ（立方晶窒化ホウ素）粒またはダイヤモンド等の超砥粒を非結晶ガラス結合剤で結合したビトリファイドボンド砥石に関するものである。   The present invention relates to a vitrified bond grindstone obtained by bonding superabrasive grains such as CBN (cubic boron nitride) grains or diamond with an amorphous glass binder.

従来より、ビトリファイドガラスを結合剤に用いた研削砥石としてビトリファイドボンド砥石がある。ビトリファイドボンド砥石は一般的に超砥粒間を非結晶ガラス結合剤でボンドブリッジと呼ばれる状態にて結合するが、ボンドブリッジ同士の間には外気に連通する大きな連続気孔があり、そのため砥粒の保持強度上、課題があり、砥粒の脱落が早く重切削等には不向きであった。そこで特許文献１に示すように、非結晶ガラス結合剤を無気孔とし超砥粒の保持強度を高め、重切削にも対応可能なようにしたビトリファイドボンド砥石がある。
特開２００２−２２４９６３ Conventionally, there is a vitrified bond grindstone as a grindstone using vitrified glass as a binder. Vitrified bond wheels generally bond superabrasive grains with an amorphous glass binder in a state called a bond bridge, but there are large continuous pores communicating with the outside air between the bond bridges. There was a problem in terms of holding strength, and abrasive grains dropped off quickly and were not suitable for heavy cutting. Therefore, as shown in Patent Document 1, there is a vitrified bond grindstone in which an amorphous glass binder is made non-porous and the holding strength of superabrasive grains is increased so that it can cope with heavy cutting.
JP 2002-224963 A

しかしながら、特許文献１に示すビトリファイドボンド砥石においては、非結晶ガラス結合剤が無気孔であるためドレッシングが困難となり、ドレッシング作業に多大な時間を要するという課題がある。   However, in the vitrified bond grindstone shown in Patent Document 1, dressing is difficult because the amorphous glass binder is non-porous, and there is a problem that a long time is required for the dressing operation.

本発明は、かかる従来の不具合を解消するためになされたもので、砥粒の保持力が強く、かつドレス性が良好である低コストで長寿命なビトリファイドボンド砥石を提供することを目的とする。   The present invention has been made in order to solve such conventional problems, and an object thereof is to provide a low-cost and long-life vitrified bond grindstone having a strong abrasive holding force and good dressability. .

上記課題を解決するために、請求項１に係る発明の構成上の特徴は、立方晶窒化ホウ素（ＣＢＮ）粒またはダイヤモンド粒からなる超砥粒をビトリファイドボンド結合剤により結合及び保持してなるビトリファイドボンド砥石において、前記ビトリファイドボンド結合剤は酸化物粒子と非結晶ガラスとからなり、該結合剤内部には外気に連通する連続気孔を有しないことである。   In order to solve the above-mentioned problems, the constitutional feature of the invention according to claim 1 is that vitrified formed by bonding and holding superabrasive grains made of cubic boron nitride (CBN) grains or diamond grains with a vitrified bond binder. In the bond grindstone, the vitrified bond binder is composed of oxide particles and amorphous glass, and the binder does not have continuous pores communicating with the outside air.

請求項２に係る発明の構成上の特徴は、請求項１において、前記ビトリファイドボンド結合剤の内部には外気に連通しない微細孤立気孔が設けられたことである。   The structural feature of the invention according to claim 2 is that, in claim 1, fine isolated pores that do not communicate with the outside air are provided inside the vitrified bond binder.

請求項３に係る発明の構成上の特徴は、請求項１または請求項２において、前記ビトリファイドボンド砥石における前記ビトリファイドボンド結合剤の占める体積Ａと、前記立方晶窒化ホウ素（ＣＢＮ）粒またはダイヤモンド粒からなる超砥粒の占める体積Ｂとの比率Ａ／Ｂが1〜６であることである。   The structural feature of the invention according to claim 3 is that in claim 1 or claim 2, the volume A occupied by the vitrified bond binder in the vitrified bond grindstone and the cubic boron nitride (CBN) grains or diamond grains The ratio A / B to the volume B occupied by the superabrasive grains is 1 to 6.

請求項４に係る発明の構成上の特徴は、請求項１乃至請求項３のいずれか1項において、前記ビトリファイドボンド結合剤を構成する前記酸化物粒子と、前記非結晶ガラスとの体積比が３：７〜４：６の範囲にあることである。   A structural feature of the invention according to claim 4 is that, in any one of claims 1 to 3, the volume ratio of the oxide particles constituting the vitrified bond binder to the amorphous glass is as follows. It is in the range of 3: 7 to 4: 6.

請求項５に係る発明の構成上の特徴は、請求項１乃至請求項４のいずれか1項において、前記酸化物粒子および前記非結晶ガラスの線熱膨張係数は共に（３．５±２）×１０−６（１／℃）であることである。 The structural feature of the invention according to claim 5 is that, in any one of claims 1 to 4, the linear thermal expansion coefficients of the oxide particles and the amorphous glass are both (3.5 ± 2). × 10 −6 (1 / ° C.).

請求項６に係る発明の構成上の特徴は、請求項２乃至請求項５のいずれか1項において、前記微細孤立気孔の直径は前記超砥粒の粒径に対し１％〜１０数％の粒径であることである。   The structural feature of the invention according to claim 6 is that, in any one of claims 2 to 5, the diameter of the fine isolated pores is 1% to several tens% with respect to the particle diameter of the superabrasive grains. It is a particle size.

請求項７に係る発明の構成上の特徴は、請求項２乃至請求項６のいずれか1項において、前記微細孤立気孔は、８％±４％の体積割合で前記ビトリファイドボンド結合剤内に封入されていることである。   The structural feature of the invention according to claim 7 is that in any one of claims 2 to 6, the fine isolated pores are enclosed in the vitrified bond binder at a volume ratio of 8% ± 4%. It has been done.

請求項８に係る発明の製造上の特徴は、請求項２乃至請求項７のいずれか1項において、前記微細孤立気孔は粉末状の発泡剤が焼成前の前記ビトリファイドボンド結合剤に所定量混入され、焼成時に前記発泡剤と前記非結晶ガラスとが反応し発泡されることによってビトリファイドボンド砥石内に形成されることである。   The manufacturing feature of the invention according to claim 8 is the manufacturing feature of any one of claims 2 to 7, wherein the fine isolated pores are mixed with a predetermined amount of the powdered foaming agent in the vitrified bond binder before firing. In addition, the foaming agent and the amorphous glass react and foam when fired to form in the vitrified bond grindstone.

上記のように構成した請求項１による発明によれば、ビトリファイドボンド結合剤は非結晶ガラスと、砥石製造時の形状保持および非結晶ガラスの強度向上のために混入された酸化物粒子とからなり、該結合剤内部には外気に連通する連続気孔を有しない。これにより砥粒の保持力は向上し砥粒の脱落による摩耗が抑制され、長寿命化しコストの低減が図られる。   According to the invention according to claim 1 configured as described above, the vitrified bond binder is composed of amorphous glass and oxide particles mixed for maintaining the shape at the time of manufacturing the grindstone and improving the strength of the amorphous glass. The binder does not have continuous pores communicating with the outside air. As a result, the holding power of the abrasive grains is improved, wear due to falling off of the abrasive grains is suppressed, the life is extended, and the cost is reduced.

上記のように構成した請求項２による発明によれば、ビトリファイドボンド結合剤の内部には外気に連通しない微細孤立気孔が設けられる。これにより砥粒の保持力を低下させることなく砥石のドレス性を向上させることができる。   According to the invention of claim 2 configured as described above, fine isolated pores that do not communicate with the outside air are provided inside the vitrified bond binder. Thereby, the dressing property of a grindstone can be improved, without reducing the holding power of an abrasive grain.

上記のように構成した請求項３による発明によれば、ビトリファイドボンド砥石におけるビトリファイドボンド結合剤の占める体積Ａと、立方晶窒化ホウ素（ＣＢＮ）粒または前記ダイヤモンド粒からなる超砥粒の占める体積Ｂとの比率Ａ／Ｂが1〜６であり、この超砥粒の低集中度化により初期から研削抵抗が低減され、研削焼けが抑制されて、品質が向上するとともに長寿命化が図られる。   According to the invention of claim 3 configured as described above, the volume A occupied by the vitrified bond binder in the vitrified bond wheel and the volume B occupied by cubic boron nitride (CBN) grains or superabrasive grains composed of the diamond grains. The ratio A / B is 1 to 6, and by reducing the degree of concentration of the superabrasive grains, the grinding resistance is reduced from the beginning, grinding burn is suppressed, the quality is improved, and the life is extended.

上記のように構成した請求項４による発明によれば、ビトリファイドボンド結合剤を構成する酸化物粒子と、非結晶ガラスとの体積比を３：７〜４：６の範囲内とする。これにより非結晶ガラスの流動性を抑制し、ビトリファイドボンド砥石の形状を所望の形状に成形できる。   According to the invention according to claim 4 configured as described above, the volume ratio between the oxide particles constituting the vitrified bond binder and the amorphous glass is in the range of 3: 7 to 4: 6. Thereby, the fluidity | liquidity of an amorphous glass can be suppressed and the shape of a vitrified bond grindstone can be shape | molded in a desired shape.

上記のように構成した請求項５による発明によれば、酸化物粒子および非結晶ガラスの線熱膨張係数は共に（３．５±２）×１０−６（１／℃）である。この値は砥粒の線熱膨張係数とほぼ同じ値であり、よって砥粒と、酸化物粒子および非結晶ガラスとは温度の変化によって剥離する恐れはなく、砥石は安定した品質の維持が図られる。 According to the invention according to claim 5 as constructed above, the linear thermal expansion coefficient of the oxide particles and amorphous glass are both (3.5 ± 2) × 10 -6 (1 / ℃). This value is almost the same as the linear thermal expansion coefficient of the abrasive grains. Therefore, there is no fear that the abrasive grains, oxide particles and amorphous glass will be peeled off due to temperature change, and the grindstone can maintain stable quality. It is done.

上記のように構成した請求項６による発明によれば、微細孤立気孔の直径は超砥粒の粒径に対し１％〜１０数％の粒径である。これにより安定して砥粒の保持力を維持しつつ、一層砥石のドレス性を向上させることができる。   According to the invention according to claim 6 configured as described above, the diameter of the fine isolated pores is 1% to several tens% of the particle diameter of the superabrasive grains. Thereby, the dressability of the grindstone can be further improved while maintaining the holding power of the abrasive grains stably.

上記のように構成した請求項７による発明によれば、微細孤立気孔は、ビトリファイドボンド結合剤内に８％±４％の体積割合で混入される。これによりビトリファイドボンド砥石は立方晶窒化ホウ素（ＣＢＮ）粒またはダイヤモンド粒からなる超砥粒を安定して強固に保持し、かつ短時間でドレッシング作業ができる良好なドレス性を有する。   According to the invention of claim 7 configured as described above, the fine isolated pores are mixed in the vitrified bond binder at a volume ratio of 8% ± 4%. Thereby, the vitrified bond grindstone has a good dressing property that can stably and firmly hold superabrasive grains made of cubic boron nitride (CBN) grains or diamond grains, and can perform a dressing operation in a short time.

上記のように構成した請求項８による発明によれば、微細孤立気孔は、粉末状の発砲剤が焼成前のガラス剤に混入され焼成時に発砲剤が反応し、発砲されることによってビトリファイドボンド砥石内に形成される。これによって容易に、所定量の微細孤立気孔をビトリファイドボンド砥石内に得ることができ低コストで超砥粒を強固に保持し、かつ短時間でドレッシング作業ができる性能を得ることができる。   According to the invention according to claim 8 configured as described above, the fine isolated pores are obtained by mixing a powdered foaming agent into a glass agent before firing, and the firing agent reacts and fires at the time of firing. Formed inside. This makes it possible to easily obtain a predetermined amount of fine isolated pores in the vitrified bond grindstone, to firmly hold the superabrasive grains at low cost, and to obtain a performance capable of performing a dressing operation in a short time.

以下、本発明の実施形態を図面に基づいて説明する。図１において、砥石車１１は、鉄又はアルミニウム等の金属で成形された円盤状の基体１２の外周面に厚さ５〜１０mmの円弧状のビトリファイドボンド砥石１３が複数個接着されて構成されている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, a grinding wheel 11 is configured by bonding a plurality of arc-shaped vitrified bond grinding stones 13 having a thickness of 5 to 10 mm to an outer peripheral surface of a disk-like base body 12 formed of a metal such as iron or aluminum. Yes.

ビトリファイドボンド砥石１３は図２の模式図に示すように立方晶窒化ホウ素（CBN）粒、またはダイヤモンド等の超砥粒１４と、酸化物粒子１５ａおよび結合剤である非結晶ガラス１５ｂからなるビトリファイドボンド結合剤１５とから構成される。超砥粒１４はビトリファイドボンド結合剤１５によって外周を覆われ、かつビトリファイドボンド結合剤１５内には微細孤立気孔１８が所定量設けられている。しかし外気に連通される連続気孔は形成されていない。   As shown in the schematic view of FIG. 2, the vitrified bond grindstone 13 is a vitrified bond comprising cubic boron nitride (CBN) grains or superabrasive grains 14 such as diamond, oxide particles 15a and an amorphous glass 15b as a binder. And a binder 15. The superabrasive grains 14 are covered with a vitrified bond binder 15, and a predetermined amount of fine isolated pores 18 are provided in the vitrified bond binder 15. However, continuous pores communicating with the outside air are not formed.

酸化物粒子１５ａは、非結晶ガラス１５ｂの強度を高めるために添加されるものであり例えばケイ酸塩鉱物であるＺｒＳｉＯ4（ジルコン）やＴｉＯ2（チタニア）、ＺｒＯ2（ジルコニア）、Ｃｒ2Ｏ3（クロミア）等が用いられ、非結晶ガラス１５ｂは例えばホウケイ酸ガラス等が用いられる。酸化物粒子１５ａと、非結晶ガラス１５ｂの線熱膨張係数は、結合される超砥粒１４の線熱膨張係数とほぼ同じ値である（３．５±２）×１０−６（１／℃）の範囲内にあるものが好ましい。この値は超砥粒１４の線熱膨張係数とほぼ同じ値であり、よって超砥粒１４と、酸化物粒子１５ａおよび非結晶ガラス１５ｂとは温度の変化によって剥離する恐れはなく、ビトリファイドボンド砥石１３は品質の維持が図られる。なお、酸化物粒子１５ａは例えば酸化アルミニウム（Ａｌ２Ｏ３）等でもよく、非結晶ガラス１５ｂは例えばリン酸塩ガラスや、ホウ酸塩ガラス等であってもよい。 The oxide particles 15a are added to increase the strength of the amorphous glass 15b. For example, ZrSiO 4 (zircon), TiO 2 (titania), ZrO 2 (zirconia), Cr 2 O, which are silicate minerals. 3 (chromia) or the like is used, and the amorphous glass 15b is, for example, borosilicate glass. The linear thermal expansion coefficients of the oxide particles 15a and the amorphous glass 15b are substantially the same as the linear thermal expansion coefficient of the superabrasive grains 14 to be bonded (3.5 ± 2) × 10 −6 (1 / ° C. ) Is preferable. This value is almost the same as the linear thermal expansion coefficient of the superabrasive grains 14, and therefore there is no fear that the superabrasive grains 14, the oxide particles 15a, and the amorphous glass 15b are peeled off due to temperature changes, and the vitrified bond grindstone. 13 is intended to maintain quality. The oxide particles 15a may be aluminum oxide (Al 2 O 3 ), for example, and the amorphous glass 15b may be phosphate glass, borate glass, or the like.

ビトリファイドボンド結合剤１５を構成する酸化物粒子１５ａと、非結晶ガラス１５ｂは体積比で３：７〜４：６の範囲内で混合され形成される。これは酸化物粒子１５ａの混合割合を３０％以下にすると、非結晶ガラス１５ｂの流動性が抑制できず焼成前或いは焼成中にビトリファイドボンド砥石１３の形状を保てず角部がだれてしまう。また混合割合を４０％以上にすると、酸化物粒子１５ａを含んだ状態での非結晶ガラス１５ｂが強くかつ硬くなり過ぎ、ドレス性が悪くなるとともに研削時の発熱量が多くなり研削焼けを生じる可能性があるためである。本発明に係るビトリファイドボンド砥石１３では、酸化物粒子１５ａの混合割合を３０〜４０容量％とすることにより適切な硬さの砥石１３を所望形状に焼成している。   The oxide particles 15a constituting the vitrified bond binder 15 and the amorphous glass 15b are mixed and formed in a volume ratio of 3: 7 to 4: 6. If the mixing ratio of the oxide particles 15a is 30% or less, the fluidity of the amorphous glass 15b cannot be suppressed, and the shape of the vitrified bond grindstone 13 cannot be maintained before or during firing, and the corners are bent. Further, when the mixing ratio is 40% or more, the amorphous glass 15b containing the oxide particles 15a becomes too strong and hard, the dressing property is deteriorated, and the amount of heat generated during grinding is increased, which may cause grinding burn. It is because there is sex. In the vitrified bond grindstone 13 according to the present invention, the grindstone 13 having appropriate hardness is fired into a desired shape by setting the mixing ratio of the oxide particles 15a to 30 to 40% by volume.

またビトリファイドボンド砥石１３内においてビトリファイドボンド結合剤１５の占める体積Ａと超砥粒１４の占める体積Ｂとの比率Ａ／Ｂは、１〜６の範囲で形成されるのがよい。この体積の比率は超砥粒１４の集中度に換算すると５０〜２００に相当し、この低集中度によって、ビトリファイドボンド砥石１３は初期から大きな研削抵抗を受けることなく、研削焼けの起きる恐れがない。   The ratio A / B between the volume A occupied by the vitrified bond binder 15 and the volume B occupied by the superabrasive grains 14 in the vitrified bond grindstone 13 is preferably in the range of 1-6. This volume ratio corresponds to 50 to 200 in terms of the concentration of the superabrasive grains 14, and this low concentration does not cause the vitrified bond grindstone 13 to receive a large grinding resistance from the beginning, and there is no risk of grinding burn. .

酸化物粒子１５ａである例えばＺｒＳｉＯ4（ジルコン）粒子が混入され焼成されたビトリファイドボンド結合剤１５は超砥粒１４の外周を覆って隣接する各超砥粒１４間の隙間を埋め各超砥粒１４と結合している。隙間部に埋められたビトリファイドボンド結合剤１５内には所定体積比の微細孤立気孔１８が形成されている。微細孤立気孔１８とは外気と連通することなく形成された微細な孤立した気泡であり、所定体積比とはビトリファイドボンド結合剤１５の超砥粒１４に対する保持力を維持するとともに、かつビトリファイドボンド結合剤１５に対する良好なドレス性を維持するのに適した体積比であって、その体積比はビトリファイドボンド結合剤１５を構成する非結晶ガラス１５ｂの体積に対し８％±４％とされるのがよい。微細孤立気孔１８の体積のコントロールは後述する製造過程で混入される発泡剤の量を調整することによって行なわれる。また微細孤立気孔１８の平均粒径はビトリファイドボンド結合剤１５の超砥粒１４に対する保持力を維持するとともに、かつビトリファイドボンド結合剤１５に対する良好なドレス性を維持するために超砥粒１４の粒径の１〜１０数％になるよう形成されるのが望ましい。 Vitrified bond binder 15 which is mixed with oxide particles 15a such as ZrSiO 4 (zircon) particles and baked fills the gap between adjacent superabrasive grains 14 covering the outer periphery of superabrasive grains 14, and each superabrasive grain. 14. Fine isolated pores 18 having a predetermined volume ratio are formed in the vitrified bond binder 15 buried in the gap. The fine isolated pores 18 are fine isolated bubbles formed without communicating with the outside air, and the predetermined volume ratio maintains the holding force of the vitrified bond binder 15 on the superabrasive grains 14 and vitrified bond bonding. The volume ratio is suitable for maintaining good dressability with respect to the agent 15, and the volume ratio is 8% ± 4% with respect to the volume of the amorphous glass 15b constituting the vitrified bond binder 15. Good. The volume of the fine isolated pores 18 is controlled by adjusting the amount of the foaming agent mixed in the manufacturing process described later. In addition, the average particle size of the fine isolated pores 18 maintains the holding force of the vitrified bond binder 15 on the superabrasive grains 14 and also maintains the good dressability with respect to the vitrified bond binder 15. It is desirable to form so as to be 1 to 10% of the diameter.

次に、ビトリファイドボンド砥石１３の製造法について説明する。まず、ビトリファイドボンド結合剤１５の原材料となる酸化剤粒子１５ａの粉末と、非結晶ガラス１５ｂの粉末とを体積比が３：７〜４：６の範囲内になるように均一に混ぜ合わせる。   Next, the manufacturing method of the vitrified bond grindstone 13 is demonstrated. First, the powder of the oxidant particles 15a, which is the raw material of the vitrified bond binder 15, and the powder of the amorphous glass 15b are mixed uniformly so that the volume ratio is in the range of 3: 7 to 4: 6.

次に、ビトリファイドボンド結合剤１５の中に立方晶窒化ホウ素（CBN）粒、またはダイヤモンド等の超砥粒１４を混入し均等に分散させる。混入する比率はビトリファイドボンド結合剤１５の体積Ａと超砥粒１４の体積Ｂとの体積比Ａ／Ｂが１〜６の範囲になるようにする。   Next, cubic boron nitride (CBN) grains or superabrasive grains 14 such as diamond are mixed in the vitrified bond binder 15 and dispersed uniformly. The mixing ratio is such that the volume ratio A / B between the volume A of the vitrified bond binder 15 and the volume B of the superabrasive grains 14 is in the range of 1-6.

さらにビトリファイドボンド結合剤１５中に微細孤立気孔１８を形成するため上述した発泡剤である例えばＨＢＮ（６方晶窒化ホウ素）等を粉末状態にて均等に混ぜ合わせる。このとき発泡剤の投入量は非結晶ガラス１５ｂの体積に対し０．５％〜２％とするのが望ましい。なお発泡剤はホタル石（ＣａＦ２）や炭酸カルシウム（ＣａＣｏ３）等でもよい。 Further, in order to form fine isolated pores 18 in the vitrified bond binder 15, the above-mentioned foaming agent such as HBN (hexagonal boron nitride) is mixed evenly in a powder state. At this time, it is desirable that the amount of the blowing agent is 0.5% to 2% with respect to the volume of the amorphous glass 15b. The foaming agent may be fluorite (CaF 2 ) or calcium carbonate (CaCo 3 ).

次にビトリファイドボンド結合剤１５を型内で所定の圧力にてプレスし成形した後、焼成する。なお、プレス圧を調整することによりビトリファイドボンド結合剤の強度を若干調整することが可能である。そして、焼成段階において発泡剤である例えばＨＢＮ（６方晶窒化ホウ素）と、非結晶ガラス１５ｂとが反応しガスが発生する。発生したガスは微細孤立気孔１８としてビトリファイドボンド結合剤１５内に所定量が形成されビトリファイドボンド砥石１３が得られる。   Next, the vitrified bond binder 15 is pressed and molded in a mold at a predetermined pressure, and then fired. The strength of the vitrified bond binder can be slightly adjusted by adjusting the pressing pressure. In the firing stage, for example, HBN (hexagonal boron nitride), which is a foaming agent, reacts with the amorphous glass 15b to generate gas. A predetermined amount of the generated gas is formed in the vitrified bond binder 15 as fine isolated pores 18 to obtain a vitrified bond grindstone 13.

このとき微細孤立気孔１８の平均粒径は前述の通り超砥粒１４の平均粒径に対し１％〜１０数％程度になるよう形成されるのが望ましい。具体的には例えば超砥粒１４の粒径が１００μｍであれば数μｍ〜十数μｍとするのがよく、発泡剤の混入量を調整して対応する。そして図１に示すように、ビトリファイドボンド砥石１３を基体１２の外周面に接着剤で貼り付けて、砥石車１１ を得る。   At this time, it is desirable that the average particle diameter of the fine isolated pores 18 is formed to be about 1% to 10 several percent with respect to the average particle diameter of the superabrasive grains 14 as described above. Specifically, for example, when the particle size of the superabrasive grains 14 is 100 μm, the diameter is preferably several μm to several tens of μm. Then, as shown in FIG. 1, a vitrified bond grindstone 13 is attached to the outer peripheral surface of the base 12 with an adhesive to obtain a grindstone 11.

次に、本発明に係るビトリファイドボンド砥石１３の研削加工時における作用について説明する。砥石車１１を回転可能に軸承された研削盤の砥石軸に固定して回転駆動し、工作物を主軸台及び心押台間に挟持して回転駆動し、砥石車１１と工作物との間にクーラントを供給しながら砥石台を工作物に向かって研削送りして、砥石車１１の外周面に接着された本発明に係るビトリファイドボンド砥石１３により工作物を研削加工する。なお、このときビトリファイドボンド砥石１３はツルーイング及びドレッシング作業によって研削面２０に超砥粒１４が突出され、突出された各超砥粒１４間にはチップポケットが形成されている。   Next, the operation of the vitrified bond grindstone 13 according to the present invention during grinding will be described. The grinding wheel 11 is fixed to a grinding wheel shaft of a grinding machine rotatably supported and rotationally driven. The workpiece is sandwiched between a spindle stock and a tailstock and rotationally driven, so that the grinding wheel 11 is placed between the grinding wheel 11 and the workpiece. The grindstone is ground and fed toward the workpiece while supplying coolant to the workpiece, and the workpiece is ground by the vitrified bond grindstone 13 according to the present invention bonded to the outer peripheral surface of the grinding wheel 11. At this time, in the vitrified bond grindstone 13, superabrasive grains 14 are projected on the grinding surface 20 by truing and dressing operations, and chip pockets are formed between the projected superabrasive grains 14.

工作物は、ビトリファイドボンド砥石１３の研削面２０に突出する超砥粒１４によって表面が研削除去され切粉が発生される。発生された切粉は研削面２０に突出する各超砥粒１４間のチップポケットに排出される。チップポケットに排出された切粉は工作物と接触しないため工作物表面を傷つける恐れがない。またビトリファイドボンド砥石１３の超砥粒１４は低集中度で成形されているため工作物との接触による発熱が抑制され研削焼けが防止される。その後研削加工が進み、やがて超砥粒１４が摩耗されて、研削面２０からの超砥粒１４の突出量ｔ（図２参照）が減少してきたら、ドレッシングを実施し研削面２０を後退させる。このときビトリファイドボンド結合剤１５は微細孤立気孔１８を所定量有しているとともに微細孤立気孔１８は外気と連通する連続気孔がないように形成されているので、良好なドレス性を有し短時間でドレッシング作業が行なえるとともに、超砥粒１４の保持力も十分有しているため、早期での砥粒の脱落による摩耗の恐れもない。   The surface of the workpiece is ground and removed by superabrasive grains 14 protruding from the grinding surface 20 of the vitrified bond grindstone 13 to generate chips. The generated chips are discharged into the chip pockets between the superabrasive grains 14 protruding on the grinding surface 20. Since the chips discharged in the chip pocket do not come into contact with the workpiece, there is no risk of damaging the surface of the workpiece. Further, since the superabrasive grains 14 of the vitrified bond grindstone 13 are formed at a low concentration, heat generation due to contact with the workpiece is suppressed and grinding burn is prevented. After that, when the grinding process proceeds and the superabrasive grains 14 are worn out and the protrusion amount t (see FIG. 2) of the superabrasive grains 14 from the grinding surface 20 decreases, dressing is performed and the grinding surface 20 is retracted. At this time, the vitrified bond binder 15 has a predetermined amount of fine isolated pores 18 and the fine isolated pores 18 are formed so as not to have continuous pores communicating with the outside air. In addition, the dressing operation can be performed and the holding power of the superabrasive grains 14 is sufficient, so that there is no risk of wear due to early dropout of the abrasive grains.

ここで、本発明に係るビトリファイドボンド砥石１３の超砥粒１４に対する保持力を確認するために研削比を測定した実験結果を図３に示す。図３は縦軸を砥石の単位長さあたりの摩耗体積（ｍｍ３／ｍｍ）とし、横軸を工作物の単位長さあたりの研削量Ｒ（ｍｍ３／ｍｍ）としたグラフであり、従来のビトリファイドボンド砥石（破線）と本発明に係るビトリファイドボンド砥石１３（実線）との２つの結果が示されている。グラフをみて明らかなように本発明に係るビトリファイドボンド砥石１３の工作物の研削量Ｒに対する砥石の摩耗体積の値は、従来のビトリファイドボンド砥石の摩耗体積の値に比べて、大幅に少ないことが確認できる。すなわち、本発明に係るビトリファイドボンド結合剤１５の強度が向上されたため、従来と同様の研削作業を行なってもビトリファイドボンド砥石１３の摩耗、つまり超砥粒１４の脱落を伴った摩耗は少なく、ビトリファイドボンド結合剤１５による超砥粒の保持力が向上されていることがわかる。結果を見ると従来にくらべ保持力は５倍以上に向上されたことがわかり、良好なドレス性を維持しながら、超砥粒１４の保持力を十分確保し、ビトリファイドボンド砥石１３が長寿命化されているのがわかる。 Here, the experimental result which measured the grinding ratio in order to confirm the retention strength with respect to the superabrasive grain 14 of the vitrified bond grindstone 13 concerning this invention is shown in FIG. FIG. 3 is a graph in which the vertical axis represents the wear volume per unit length of the grindstone (mm 3 / mm) and the horizontal axis represents the grinding amount R (mm 3 / mm) per unit length of the workpiece. Two results are shown: a vitrified bond grindstone (broken line) and a vitrified bond grindstone 13 (solid line) according to the present invention. As is apparent from the graph, the wear volume value of the grindstone with respect to the grinding amount R of the workpiece of the vitrified bond grindstone 13 according to the present invention is significantly smaller than the wear volume value of the conventional vitrified bond grindstone. I can confirm. That is, since the strength of the vitrified bond binder 15 according to the present invention is improved, the wear of the vitrified bond grindstone 13, that is, the wear accompanied by the dropping of the superabrasive grains 14 is small even when the same grinding operation as before is performed. It can be seen that the holding power of the superabrasive grains by the bond binder 15 is improved. From the results, it can be seen that the holding power was improved by more than 5 times compared to the conventional one, and the holding power of the superabrasive grains 14 was sufficiently secured while maintaining a good dressing property, and the vitrified bond grindstone 13 extended its life. You can see that.

さらに、図３に示す実験以外に超砥粒の保持強度は曲げ強度に比例するという仮定のもとビトリファイドボンド砥石に対しＪＩＳＧ０２０２に示される曲げ強度試験を実施した。結果として本発明に係るビトリファイドボンド砥石１３は従来のビトリファイドボンド砥石に対し約６０％の曲げ強度の向上を示し、この結果においても本発明に係るビトリファイドボンド砥石１３の超砥粒１４に対する保持強度が向上されたのが証明された。   Further, in addition to the experiment shown in FIG. 3, a bending strength test shown in JISG0202 was performed on a vitrified bond grindstone on the assumption that the holding strength of superabrasive grains was proportional to the bending strength. As a result, the vitrified bond grindstone 13 according to the present invention shows an improvement in bending strength of about 60% with respect to the conventional vitrified bond grindstone. Also in this result, the holding strength of the vitrified bond grindstone 13 according to the present invention with respect to the superabrasive grains 14 is high. Proven to be improved.

ビトリファイドボンド超砥粒砥石を基体の外周に接着した砥石車を示す図である。It is a figure which shows the grinding wheel which adhere | attached the vitrified bond superabrasive grindstone on the outer periphery of a base | substrate. 本発明に係るビトリファイドボンド砥石の構成を示す模式図である。It is a schematic diagram which shows the structure of the vitrified bond grindstone concerning this invention. 研削による砥石の摩耗体積と、工作物の研削体積との関係を示すグラフである。It is a graph which shows the relationship between the abrasion volume of the grindstone by grinding, and the grinding volume of a workpiece.

符号の説明Explanation of symbols

１１・・・砥石車、１２・・・基体、１３・・・ビトリファイドボンド砥石、１４・・・超砥粒、１５・・・ビトリファイドボンド結合剤、１５ａ・・・酸化物粒子、１５ｂ・・・非結晶ガラス、１８・・・微細孤立気孔、２０・・・研削面。 DESCRIPTION OF SYMBOLS 11 ... Grinding wheel, 12 ... Base | substrate, 13 ... Vitrified bond grindstone, 14 ... Superabrasive grain, 15 ... Vitrified bond binder, 15a ... Oxide particle, 15b ... Amorphous glass, 18 ... fine isolated pores, 20 ... ground surface.

Claims (8)

立方晶窒化ホウ素（ＣＢＮ）粒またはダイヤモンド粒からなる超砥粒をビトリファイドボンド結合剤により結合及び保持してなるビトリファイドボンド砥石において、
前記ビトリファイドボンド結合剤は酸化物粒子と非結晶ガラスとからなり、該結合剤内部には外気に連通する連続気孔を有しないことを特徴とするビトリファイドボンド砥石。 In a vitrified bond grindstone formed by bonding and holding superabrasive grains made of cubic boron nitride (CBN) grains or diamond grains with a vitrified bond binder,
The vitrified bond grindstone is characterized in that the vitrified bond binder is composed of oxide particles and amorphous glass, and has no continuous pores communicating with outside air inside the binder. 請求項１において、前記ビトリファイドボンド結合剤の内部には外気に連通しない微細孤立気孔が設けられたことを特徴とするビトリファイドボンド砥石。   2. The vitrified bond grindstone according to claim 1, wherein fine isolated pores that do not communicate with outside air are provided inside the vitrified bond binder. 請求項１または請求項２において、前記ビトリファイドボンド砥石における前記ビトリファイドボンド結合剤の占める体積Ａと、前記立方晶窒化ホウ素（ＣＢＮ）粒またはダイヤモンド粒からなる超砥粒の占める体積Ｂとの比率Ａ／Ｂが1〜６であることを特徴とするビトリファイドボンド砥石。   The ratio A between the volume A occupied by the vitrified bond binder and the volume B occupied by superabrasive grains made of cubic boron nitride (CBN) grains or diamond grains in the vitrified bond grindstone according to claim 1 or claim 2. Vitrified bond whetstone characterized by / B being 1-6. 請求項１乃至請求項３のいずれか1項において、前記ビトリファイドボンド結合剤を構成する前記酸化物粒子と、前記非結晶ガラスとの体積比が３：７〜４：６の範囲にあることを特徴とするビトリファイドボンド砥石。   4. The volume ratio between the oxide particles constituting the vitrified bond binder and the amorphous glass according to claim 1 is in a range of 3: 7 to 4: 6. Characterized vitrified bond whetstone. 請求項１乃至請求項４のいずれか1項において、前記酸化物粒子および前記非結晶ガラスの線熱膨張係数は共に（３．５±２）×１０−６（１／℃）であることを特徴とするビトリファイドボンド砥石。 5. The linear thermal expansion coefficient of each of the oxide particles and the amorphous glass is (3.5 ± 2) × 10 −6 (1 / ° C.) in any one of claims 1 to 4. Characterized vitrified bond whetstone. 請求項２乃至請求項５のいずれか1項において、前記微細孤立気孔の直径は前記超砥粒の粒径に対し１％〜１０数％の粒径であることを特徴とするビトリファイドボンド砥石。   The vitrified bond grindstone according to any one of claims 2 to 5, wherein the diameter of the fine isolated pores is 1% to 10% of the particle diameter of the superabrasive grains. 請求項２乃至請求項６のいずれか1項において、前記微細孤立気孔は、８％±４％の体積割合で前記ビトリファイドボンド結合剤内に封入されていることを特徴とするビトリファイドボンド砥石。   The vitrified bond grindstone according to any one of claims 2 to 6, wherein the fine isolated pores are sealed in the vitrified bond binder at a volume ratio of 8% ± 4%. 請求項２乃至請求項７のいずれか1項において、前記微細孤立気孔は粉末状の発泡剤が焼成前の前記ビトリファイドボンド結合剤に所定量混入され、焼成時に前記発泡剤と前記非結晶ガラスとが反応し発泡されることによってビトリファイドボンド砥石内に形成されることを特徴とするビトリファイドボンド砥石。   8. The fine isolated pores according to claim 2, wherein a predetermined amount of a powdery foaming agent is mixed in the vitrified bond binder before firing, and the foaming agent and the amorphous glass are mixed with each other during firing. The vitrified bond grindstone is formed in the vitrified bond grindstone by reacting and foaming.
JP2008309374A 2008-12-04 2008-12-04 Vitrified bond whetstone Expired - Fee Related JP5369654B2 (en)

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JP2008309374A JP5369654B2 (en) 2008-12-04 2008-12-04 Vitrified bond whetstone
US12/624,710 US8177871B2 (en) 2008-12-04 2009-11-24 Vitrified bonded grindstone
CN200910225700.XA CN101745874B (en) 2008-12-04 2009-11-27 Vitrified bonded grinding wheel
EP09177708A EP2193881B1 (en) 2008-12-04 2009-12-02 Vitrified bonded grinding wheel

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CN103551970A (en) * 2013-11-08 2014-02-05 谢泽 Polishing and grinding all-in-one wheel containing natural fiber, grinding material and foaming agent
JP2021000714A (en) * 2019-06-24 2021-01-07 日本レヂボン株式会社 Grindstone for cutting

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JP2012066365A (en) * 2010-09-27 2012-04-05 Jtekt Corp Cubic boron nitride grinding wheel
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JP2012091291A (en) * 2010-10-27 2012-05-17 Toyoda Van Moppes Ltd Grinding wheel and method of manufacturing the same
CN103551970A (en) * 2013-11-08 2014-02-05 谢泽 Polishing and grinding all-in-one wheel containing natural fiber, grinding material and foaming agent
JP2021000714A (en) * 2019-06-24 2021-01-07 日本レヂボン株式会社 Grindstone for cutting
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US8177871B2 (en) 2012-05-15
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EP2193881A3 (en) 2010-09-29
CN101745874B (en) 2014-08-27

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